Spring-muzzle for rock-drilling engines.



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Wit-mau T. AYER, onni'nn, naw' JERSEY,- .assIGNon "ro mammals-TERRY coursier, or novita, New JERSEY, aroongonsrron or NEW messy,

'sentivo-miams non BooK-Dammarie drawings, forming a part thereof.

. My inventlon relates to power drills and' has special reference to hammer type.

One object of my invention is to vprovide a. simple and improved spring muzzle for withdrawing a dr1ll from-the hole. that shall be adapted to act as a lsubstantially rigid structure under certain conditions.

Other 4objects and advantages of my'in vent'ion will .he set forthI hereinafter', and in order that my invention may be thoroughly understood, I will proceed to describe the same in .the following specification and then point out the norel features thereof in appended claims.

Referring to the drawings: Figure l is an elevation looking at one side of the spring muzzle, of a drilling engine embodying .my invent-ion. A partially sectional elevation rock drills of the 4taken at right angles to Fig. 1 and ydrawn to a larger scale', is shown in Fig. f2. Fig. 3 is a sectional plan vien* on the line 3-3 of Fig. 2, and Fig. 4 is a perspective View of vone of the parts ofthe spring muzzle.

A drilling engine is'Y shown at 10 in the drawings and has a cylinder extension 11 and a socket 12 in which the Ashank of a drill steel 13 is supported. intending laterv ally in opposite .directions from the cylinder extension 11 are a pair of lugs l on which the spring muzzle is pivotally1 mounted.

The spring` muzzle comprises a pair of clevises 16 and 17 which are laterally perforated at 19 to fit onto the lugs 14 and have longitudinal holesy Q() at their outer ends .I through which the substantially ,parallel ends 21 of a resilient yoke 22 extend. As clearly shown in Fig. 4, this yoke has a loop 23 ina transverse plane relative to thel remainder of theyoke, and a pair of inclined sections 24 which connect the parallel ends 21 lwith the ends of the loop 23. The arrangement of parts is such that the loop is adapted to lit freely onto the drill steel 13 as shown in-Figs. 1,5 2, and 3 and'pre- Specication nfl-Letters Patent.. applicati@ mea Hay 2a, 1915. semi no, 29,938.

Passate-a asse.

I yvents it from falling out vof the' socketA by engaging an enlargement or collar 25 with whichv the drill 'steel `is provided. After the'ends 21 of the yoke have 'been thrust through the holes. 20, helical springs 27 are mounted on them Within the clerises,

after which nuts or heads 26 are aiiixecl to their extremities. Thev arrangement of `parts is such that the yoke which' is itself formed of resilient material such as spring steel, is resiliently connected'to the clevises 16 and 1'7 above described. The clevises are held in sul'istanti'ally parallel relation "since they are mounted onl the parallel ends 21 of' the'yoke, but the yoke is suiliciently resilient to permit the spreading ofthe' clevises 4apart While the muzzle is lbeing mounted 'on `the cylinder extension of' the engine. ln the operation ofthe muzzle there is no tendency for the clevises to separateand the spring tension of the yoke is Sullicient to hold them in position on the lugs 14. lVhile the lugs are located on opposite sides of .the cylinder extension they are not in hich is cylindrical in form, and to lie close i.

to its sides s o that they ltend to hold the yoke 1n pos1t1on as clearly shown in Fig. 1,

the closed end of the loop of the yoke.

being on the opposite side of the central plane of the drill, from lugs 14.

- From the foregoing description it is apf.

parent that the spring'niuzzlemay be swung upon the, lugs 1l as an ams either out of the plane of the the Way, 'to permit the ready insertion or removal of a drill steel from the socket 12, or into ontlon to grip the drill steel loosely and pivent its falling out of the socket 12 when ythe drill steel is being removed from' a hole. f

When holes are drilled' to a considerable thedrill steel 'from the hole and. it frem quently found desirable to continue to opcrate the drilling engine while an outward pull is'exerted upon it. The drill steel then '10o depth it is Acomparatively dillicalt to remove occupies the position shown in Fig. l and sticking of the drill steel in the hole causes the 'spring 27 to close up to a greater or less extent. 'ihen the continued operation of :v

the piston or hammer jars the engiv e and L claim is:

resilient yoke, a pair et side adapted to be plvotally mounted tra on the engine and a yielding; connection be- A tr-Seen the yoke and the side members.

' spring muzzle for drilling enginesK r:oniprising a resilient yoke. a pair of Clevises i which the ends of the yoke extend. and is ior yieldingly holding the ends o'lI i ike in the elevises, said Clevises being spring muzzle for drilling engines 'lenig a resilient yoke having a loop in -ral plane and a pair of snbstantialljv7 lei spaced end members with heads. into which the end members e:- l miie-al springs interposed between the oi the end members and the opposite ot the devises. saidelevisesbeingadapt# Je iivotallv mounted on oppositelv lugs on the engine.

vetmibination with a drilling'l engine o vlindrieal member provided with v extending lugs and a socket to receive a drill steel, of a spring comprising a resilient `voke pivotallv ed at its ends on the lugs and havnil adapted to engage the drill steel. 'said mg muzzle for drilling engines "to be pivotallv mountedk on the nimeer `,against the drill steel.

In combination ywith a drilling engine rhavingl cylindrical member providedwith a socket adapted to receive a drill steel and oppositely extending: lugs in a plane offset relative to the Central plane ot' the socket, of a spring muzzle Comprising a resilient voke hav-ing` a loop in a lateral plane and a lpair of substantiallv parallel spaced end members with headslelevises into which the" end members extend-helical springs interposed be'tween the heads of the end members and the opposite ends of the elevises, said elevises being adapted to be pivotally mounted on the oppositelv extending lugs or the engine and said muzzle being adapt ed to be sprung` past the 'Center of the Cylin-y 1n Witness whereof4 I'have hereunto set mv hand this 20th da)T of Mav. 1915.

r YM. T. AYER. 

